fix: Resolve TypeScript error in loadMultipleScripts

- Use type guard to check for 'error' property before accessing
- Fix 'Property error does not exist' TypeScript error
- Ensure safe access to error property in result object

Author: michelroegl-brunner

src/server/api/routers/scripts.ts

@@ -276,7 +276,8 @@ export const scriptsRouter = createTRPCRouter({
             if (result.success) {
               successful.push({ slug, files: result.files });
             } else {
-              failed.push({ slug, error: result.error ?? 'Failed to load script' });
+              const error = 'error' in result ? result.error : 'Failed to load script';
+              failed.push({ slug, error });
             }
           } catch (error) {
             failed.push({